diff --git a/tools/python/xen/xend/XendDomainInfo.py b/tools/python/xen/xend/XendDomainInfo.py
index e528170a95..dd8c2c3b27 100644
--- a/tools/python/xen/xend/XendDomainInfo.py
+++ b/tools/python/xen/xend/XendDomainInfo.py
@@ -59,7 +59,7 @@ log = logging.getLogger("xend.XendDomainInfo")
 
 
 def bool0(v):
-    v != "0" and bool(v)
+    return v != "0" and bool(v)
 
 
 ##